Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Method of refining furfural through six-tower continuous rectification

A technology of furfural and rectification, applied in the direction of organic chemistry, can solve the problems of wasting furfural, not making full use of heat energy, polluting the surrounding environment, etc., and achieve the effects of reducing corrosion, reducing yield and saving energy

Active Publication Date: 2012-09-19
TIANJIN UNIV +1
View PDF6 Cites 20 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the five-tower continuous distillation, the furfural vapor is condensed and then enters the initial distillation tower, which does not make full use of heat energy; and the process is to remove light first and then wash with water, and the bottom material of the light removal tower needs to return to the initial distillation tower and then evaporate; at the same time, the aldehyde sludge at the bottom of the tower is refined It contains about 10% furfural, which is not processed in the five-tower continuous distillation process. If it is directly used as fuel, it will not only waste some furfural but also pollute the surrounding environment.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method of refining furfural through six-tower continuous rectification
  • Method of refining furfural through six-tower continuous rectification
  • Method of refining furfural through six-tower continuous rectification

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The vapor pressure of furfural is 0.6MPa, the temperature is 158.6℃, its mass composition is methanol 0.1%, formic acid 1%, acetic acid 2%, methylfurfural 2.5%, furfural 8%, water 86.3%, acetone content 400mg / L, the raw material is first The 0.4MPa water vapor is generated by the steam generator as the steam source of the stripping tower; the aldehyde vapor is then heat-exchanged with the reboiler of the initial distillation tower, and the temperature drops to 90°C, and then fed from the middle and upper part of the initial distillation tower. Operated under normal pressure, the temperature at the top of the tower is 97.4°C. The furfural water azeotrope produced at the top of the initial distillation tower is refluxed to the initial distillation tower through the upper water phase condensed in the phase separation tank of the initial distillation tower, and the initial distillation tower is separated. The furfural phase in the middle and lower layers of the tank is sent ...

Embodiment 2

[0022] The furfural vapor pressure is 0.7MPa, the temperature is 164.7°C, and its mass composition is methanol 0.1%, formic acid 1.4%, acetic acid 2.5%, methylfurfural 3%, furfural 6.8%, water 86.1%, acetone content 385mg / L, other processes Condition is identical with embodiment 1, and the product that refining tower tower top obtains consists of: acetic acid content 144mg / L, formic acid content 108 mg / L, methanol content 28mg / L, water content 0.03%, methyl furfural content is 0.7%, furfural The content is 99.2%, and the yield of furfural is 96.1%.

Embodiment 3

[0024] The vapor pressure of furfural is 0.6MPa, the temperature is 158°C, and its mass composition is 0.6% formic acid, 1.5% acetic acid, 2% methylfurfural, 7.3% furfural, 88.4% water, 412mg / L acetone, and 871mg / L methanol. Other process conditions are the same as in Example 1, and the product obtained at the top of the refining tower consists of: acetic acid content 102 mg / L, formic acid content 135 mg / L, methanol content 10 mg / L, water content 0.042%, and methylfurfural content 0.3 %, the furfural content is 99.6%, and the furfural yield is 97.1%.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a method of refining furfural through six-tower continuous rectification. A process of the method comprises the following steps of: flowing furfural steam through a steam generator and a primary tower reboiler and then feeding into a primary tower; obtaining furfural water azeotrope on the top of the tower; condensing to split phase; reflowing the water phase; feeding aldehyde phase into a washing tower; removing acidic substances in the material by the washing tower; returning the furfural solution on the top of the tower to a primary tower feed tank; feeding output at the bottom of the tower into a light component removal tower; removing light component impurities by the light component removal tower; feeding the furfural liquid at the bottom of the tower into a dehydrating tower; obtaining furfural water azeotrope on the top of the dehydrating tower; condensing to split phase and reflowing; feeding coarse furfural produced at the bottom of the tower into a refining tower; obtaining a furfural product on the top of the refining tower; feeding high boiling point aldehyde mud at the bottom of the tower into a stripping tower; recovering the furfural from the aldehyde mud in the stripping tower; returning furfural solution on the top of the stripping tower to the primary tower feed tank; and treating the aldehyde residue at the bottom of the tower to serve as a boiler fuel. The method has the advantages of high furfural product purity, high yield, low energy consumption and low pollution.

Description

technical field [0001] The invention belongs to furfural refining technology, in particular to a six-tower continuous rectification method for refining furfural. Background technique [0002] The scientific name of furfural is furan formaldehyde. It is an important chemical raw material and has a wide range of uses in industry. It can be used as a selective solvent for separating unsaturated aliphatic compounds from saturated aliphatic compounds, and it is also a raw material for the production of various furan compounds. Its downstream products cover many industries such as petrochemical, synthetic resin, food, medicine and synthetic fiber. It is made by hydrolyzing corncobs, bagasse and other plant stalks in an acidic solution. During the production process, saturated steam is introduced into the bottom of the hydrolysis pot to obtain aldehyde vapor containing 4% to 10% furfural. At the same time, acetic acid, By-products such as methanol and acetone. [0003] There are...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): C07D307/50
Inventor 李凭力侯从学郭江辉张添锦岳昌海马未李英栋王琢
Owner TIANJIN UNIV
Features
  • Generate Ideas
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com